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Heat Transfer Analysis of Nanofluid Flow on Elliptical Tube Bundle with Different Attack Angles | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 10، شماره 1 - شماره پیاپی 19، مرداد 2023، صفحه 51-66 اصل مقاله (2.89 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2023.29900.1421 | ||
| نویسندگان | ||
| Amin Hosseini؛ Seyed Abbas Sadatsakkak* ؛ Ali Rajabpour | ||
| Department of Mechanical Engineering, Imam Khomeini International University, Qazvin, Iran | ||
| تاریخ دریافت: 01 اسفند 1401، تاریخ بازنگری: 17 تیر 1402، تاریخ پذیرش: 03 مرداد 1402 | ||
| چکیده | ||
| Flow of aluminum oxide/water nanofluid is numerically investigated in a heat exchanger at different densities of solid nanoparticles and Reynolds numbers. The behavior of heat transfer in laminar flow of single-phase nanofluid are explored at various volume fractions of oxide aluminum (0%, 2%, 4%, 6%) and Reynolds numbers (5, 15, 25, and 40) using a finite volume method. The main purpose is to study the flow behavior of nanofluid and its heat transfer in a shell and tube heat exchanger with tube banks of the elliptical cross-section with different angles of attack. The results of this study indicate that an increase in the velocity of flow enhances the heat transfer coefficient, resulting in a more uniform temperature distribution. In addition, increase of angle of attack leads to a higher velocity of the fluid flow between the tubes. At higher Reynolds numbers, more remarkable entropy reduction is observed with increasing nanoparticle volume fraction. Depending on its volume fraction, addition of solid nanoparticles at a constant Reynolds number amplifies the flow velocity components and reduces the temperature gradient. The Nusselt number can increase up to 17% in Reynolds number of 5 for all tube banks depending on the volume fraction and angle of attack, which is up to 23% for Re = 40. Therefore, the amount of shell-side friction coefficient increases by 25 to 35% for Re = 5 to 40. For all designs, the increase in the friction coefficient due to angle of attack is less important than the variations of nanofluid volume fractions. | ||
| کلیدواژهها | ||
| Shell and tube heat exchanger؛ Numerical solution؛ Nanofluid؛ Elliptic tube bank؛ Angle of attack | ||
| عنوان مقاله [English] | ||
| تحلیل انتقال حرارت جریان نانوسیال بر روی دسته لوله با مقطع بیضی شکل در زوایای حمله مختلف | ||
| چکیده [English] | ||
| در این مطالعه، جریان نانوسیال اکسید آلومینیوم/آب به صورت عددی در یک مبدل حرارتی در چگالیهای مختلف نانوذرات جامد و اعداد رینولدز بررسی میشود. هدف اصلی بررسی رفتار جریان نانوسیال و انتقال حرارت در یک مبدل حرارتی پوسته و لوله با لوله هایی با سطح مقطع بیضوی در زوایای حمله مختلف است. نتایج این مطالعه نشان می دهد که افزایش سرعت جریان به دلیل افزایش عدد رینولدز باعث افزایش ضریب انتقال حرارت و در نتیجه توزیع یکنواخت تر دما می شود. علاوه بر این، افزایش زاویه حمله منجر به سرعت بالاتر جریان سیال بین لوله ها می شود. بسته به کسر حجمی آن، افزودن نانوذرات جامد با عدد رینولدز ثابت، مولفههای سرعت جریان را تقویت میکند و باعث کاهش بیشتر گرادیان دما میشود. در همین حال، در اعداد رینولدز بالاتر، کاهش آنتروپی قابلتوجهی با افزایش چگالی نانوذرات مشاهده میشود. در نهایت وجود نانوذرات جامد، عدد رینولدز و زاویه حمله سه پارامتر موثر برای میزان شار حرارتی به بانکهای لوله هستند. عدد ناسلت می تواند تا 17% در عدد رینولدز 5 برای همه بانک های لوله بسته به کسر حجمی نانوسیال و زاویه حمله افزایش یابد. این مقدار در رینولدز 40 به 23% میرسد. علاوه بر آن مقدار ضریب اصطکاک سمت پوسته نیز از 25 تا 35 درصد برای رینولدزهای 5 و 40 افزایش می یابد. تغییر زاویه حمله (برای همه طرحها در کسرهای حجمی مختلف) نسبت به تغییرات کسر حجمی نانوسیال تاثیر کمتری در افزایش ضریب اصطکاک دارد. | ||
| کلیدواژهها [English] | ||
| مبدل حرارتی پوسته ولوله, شبیه سازی عددی, نانوسیال, دسته لوله بیضی شکل, زاویه حمله | ||
| مراجع | ||
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